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you can change that in power settings right click on the battery bottom right of the screen hit change power settings u will get options u want to change power settings look at the options you want to make it stay brite all the time right now you have it set to be brite only when plug is in change the option when its unplugged to brite also
Check whether the screen becomes dull when it comes to Windows.. (i mean if we turn on the laptop, screen should be normal and it becomes dull when it enters windows) in this case check for Battery settings (power adjustments).. if you find it is totally displaying dull, monitor should be replaced
The screen brightness is automatically adjusted by your laptop's Power Management configuration in the Control Panel. Depending on your laptop's brand you might not only have the Windows power management, but also a proprietary power management application within the control panel or in your Start Menu programs usually listed under your computer's brand name. For example a program folder called "Toshiba" under Programs for a Toshiba laptop. Anyway, I would start there. Usually you can set up the screen brightness according to whether or your computer is plugged in or working on battery. Good luck! :)
So you mean the screen goes dimmer when you remove the AC POWER ADAPTER?
If so, then this is due to the POWER SAVER mode that most laptops use for when not plugged into AC.
In control panel (if using XP) there should be a POWER MANAGMENT or BATTERY MANAGEMENT icon or section. In here there are usually settings for what you want the laptop to do with regard to power under different scenarios (ie. No adapter, with adapter, etc).
In the settings there should be an option to turn off power saving mode when the AC adapter is not plugged in.
along the bottom row of keys there should be one lable function, along the top row (usually the F- keys) there will be one that looks like a star and another one that looks like a black star, hold the function key down, click on the whiter star and the screen should get brighter.
Well, Declan try go to your display properties by right click on your desktop then left click properties. Go to settings tab and click the troubleshoot button.
Im afraid to say this however, its possible the your monitor has a problem because most laptops and as well LCD's and Flat Screen TV's have its disadvantage of its lifespan. Since these types of screens have limited feature especially on display that it doesn't distribute the light image very well inspite of its low radiation to give our visual taste more better and more clear. That's why that most of these types of monitors won't get your eyes strained. But when it comes to durability, it much lesser advantage to compare with CRT monitors.